STw4102 STMicroelectronics, STw4102 Datasheet
STw4102
Available stocks
Related parts for STw4102
STw4102 Summary of contents
Page 1
... An end of charge output pin indicates the charge termination when the fast charge current drops below 10% of the programmed current value. The STw4102 includes an accurate gas gauge based on a 13-bit AD converter. An external resistor is used between battery and ground to sense a charge/discharge current. With a typical 30 mΩ ...
Page 2
... Charging from a wall adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.4 Charging from a USB port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.5 Charging using external power devices . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.6 Charge mode summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.7 Watchdog timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 6.8 Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7 Low drop-out regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 8 Battery monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8.1 Gas gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8.2 Battery voltage monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 9 Factory OTP options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 10.1 Read and write operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 2/34 STw4102 ...
Page 3
... STw4102 10.2 Register mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 11 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 12 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Contents 3/34 ...
Page 4
... C interface Control Registers GND Thermal regulation Current Sense Voltage Sense CC/CV configuration Current defined by external resistor Internal Supply Battery Monitoring STDBY Power On Reset C32KHZ AD converter 12 bits + sign bit Battery voltage AD converter 7-12 bits TEST STw4102 VOUT SENSE BATT BATTSENSE ISET CVIS ICG+ ICG- ...
Page 5
... STw4102 2 Pin assignment P Table 1. Pin descriptions Pin # Pin name 1 MAIN 2 VOUT 3 USBPWR 4 DRIVER 5 LDODRV 6 LDOFB 7 ISET 8 CVREF 9 GND 10 CVIS 11 ICG+ 12 ICG- 13 C32KHZ 14 STDBY 15 RESETN 16 SDA 17 SCL 18 VIO 19 SENSE 20 BATT 21 BATTSENSE 22 EOCHG 23 TEST 24 PWRDETECTN In this table, the following conventions are used: I: Input ...
Page 6
... Operating supply voltage on USBPWR USB V Operating supply voltage on VIO IO V Max voltage on BATT, BATTSENSE, PWRDETECTN batt V Max voltage on VOUT out T Operating free air temperature range oper 6/34 Parameter pin IO (1) (2) Parameter STw4102 Value Unit MAIN -0 self-limited 1 A ° ...
Page 7
... STw4102 4 Electrical characteristics Table 4. CC/CV charger - V specified) Symbol Supply (V from MAIN or USB) oper I Main or USB input operating current charger I USBPWR input standby current STBY I BSENSE input current batt_sense I BATT input current batt POR_IS+ Power ON reset threshold+ POR_IS- Power ON reset threshold- Voltage regulation ...
Page 8
... C (unless otherwise specified) amb Parameter Including line and load regulation (up to 1A), V main Up to 20kHz Conditions Min Typ Max 0.5 1 7 2.4 2.5 100 2.4 2.5 100 0.45 60 Conditions Min Typ 4.47 4.7 > 6V 6.8 7.2 0.7 50 STw4102 Unit 1.5 min min 45 min 90 min 2 2 0 Max Unit 4. ...
Page 9
... STw4102 Table 6. Battery monitor - V Symbol Parameter POR_IS2+ Power ON reset threshold+ POR_IS2- Power ON reset threshold- Gas gauge A/D converter V Input offset voltage os_gg V Input voltage range in_gg I Current consumption dd_gg I Current consumption in off mode pdn_gg I Input current for ICG+ and ICG- in LSB AD converter granularity (LSB value) ...
Page 10
... C timing diagram SDA hd,sta SCL 10/34 = -30°C to 85° C (unless otherwise specified) amb Parameter Conditions su,dat t t low hd,dat Min Typ 0.6 1.3 0.6 0.6 0 20+ 0.1C b 20+ 0.1C b 0.6 t high t su,sta STw4102 Max Unit 400 kHz µs µs µs µs 0.9 us 300 ns 300 ns µs 400 pF ...
Page 11
... STw4102 Typical performance curves Figure 3. Charger voltage vs. charge current (Main charge, 4.2V and 1A settings) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 200 400 600 Icharge (mA) Figure 5. Charge current vs. temperature (charge from MAIN, 1A setting) 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -50 - Temp (°C) Figure 7. Charge voltage vs. temperature (4.2V nominal setting) 4.24 4.23 4.22 4.21 4.20 4.19 4.18 4.17 4.16 -50 - Temp (°C) Figure 4. 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 800 ...
Page 12
... Figure 11. LDO output voltage vs. temperature 4.9 4.8 4.7 4.6 4.5 - 100 125 Vmain=6V Vmain=5V 1000 1500 Battery standby current vs temperature (no MAIN, no USBPWR, gas gauge disabled) - Temp (°C) (10 mA output current) - Temp (°C) STw4102 100 125 100 125 ...
Page 13
... STw4102 Figure 13. Waveforms at USB plug-in Vusb Vbatt Ibatt Figure 14. Switching from USB charge to main charge Vmain Vbatt Ibatt 50µs/div Figure 15. Switching from main charge to USB charge Vmain Vbatt Ibatt 100µs/div Electrical characteristics 10ms/div 13/34 ...
Page 14
... Internal supply decoupling capacitor 1µF Internal voltage reference decoupling capacitor When the battery is removed, a capacitor of at least 15µF is required for low ripple on the battery line. MAIN input decoupling capacitor USBPWR input decoupling capacitor STw4102 VOUT SENSE BATT C3 BATTSENSE ISET Rset ...
Page 15
... Component list for external power devices Name Typ. value 12k set STT818B STS2DPFS20V DRIVER MAIN USBPWR STw4102 PWRDETECTN EOCHG CVREF C2 LDODRV LDOFB VIO SCL SDA GND RESETN Tolerance 1% Main charge current setting 200mΩ 1% External current sense resistor ...
Page 16
... SDA GND RESETN Reset M2 Co >= 15uF Tolerance PMOS transistor with Schottky diode PMOS transistor An output capacitor least 10µF is required. An input capacitor C4 equal to or larger than required on MAIN input. STw4102 VOUT SENSE BATT C3 BATTSENSE ISET Rset CVIS C1 32kHz C32KHZ StandBy ...
Page 17
... STw4102 6 Battery charger 6.1 Charge cycle The charge cycle is initiated when the presence of a power source on either the MAIN or USBPWR inputs is detected (the PWRDETECTN pin goes low), while the charger is enabled by the CHG_ENA bit of the REG_CHG1 control register. If both supplies are connected, the MAIN input path is selected. ...
Page 18
... ISET pin, and can be set set set REG_CHG0[ Battery Voltage Charge current Trickle Fast charge charge Constant current STw4102 is lower than the trickle batt is batt Section 9: V charge 4.10V +/-1% 4.20V +/-1% 4.30V +/-1% 4.35V +/-1% V batt V charge ...
Page 19
... To support charge currents higher than 1 A from the main supply adapter, the STw4102 provides the option to use an external power device and sense resistor. This OTP option is factory set. The STw4102 driver is able to drive an external PNP (STT818B or equivalent PMOS plus Schottky diode (STS2DPFS20V or equivalent). The driver maximum sink current is 60 mA. ...
Page 20
... The charge current is progressively reduced to maintain the die temperature in a safe area. This allows to charge the battery with the highest possible current depending on the operating conditions, and protects the device against any damage. 20/ interface (bit WDOG_RST interface. STw4102 ...
Page 21
... STw4102 7 Low drop-out regulator The purpose of the low drop-out regulator (LDO supply the phone directly from the wall adapter when the battery is low or not present. When the wall adapter is present, MOSFET is off and the phone supply is regulated at 4.7 V minus the drop voltage across D1. When the MAIN pin is not connected, MOSFET (the gate is pulled down) and the D1 diode avoids any reverse current ...
Page 22
... The transfer can take up to eight 32 kHz cycles, therefore a delay of 22/34 12 bits Counter 24 bit max Charge accumulator sign From 2’s Σ to binary EOC cg_clock cg_enable Control logic cg_calibration 32kHz STw4102 Conv_number registers Conv_data 13 registers 24 Charge registers Discharge 24 registers Discharge accumulator Control registers ...
Page 23
... STw4102 approximately 250 microseconds must be respected between the time the RD_REQ bit is set and the actual register reading. The RD_REQ bit is automatically cleared after the transfer. A high value written to the RST_CHRG, RST_DCHRG or RST_COUNTER bits of the control register resets respectively the charge accumulator, discharge accumulator or conversion counter ...
Page 24
... Factory OTP options 9 Factory OTP options Table 14 summarizes the one-time programming (OTP) options offered by STMicroelectronics to customize the STw4102 at factory level. Table 14. Factory OTP options Option TRICKLE current (wall adapter charge only) TRICKLE threshold voltage MAIN input mode at powerup Watchdog state at powerup ...
Page 25
... The first bit must be high (START), followed by the Device ID and Read/Write control bit (see Table 15). The AddrID0 to AddrID2 bits are factory programmable, their default ID value is 70h (AddrID0 = AddrID1 = AddrID2 = 0). Then, the STw4102 sends an acknowledge at the end of the 8-bit transmission. The next 8 bits correspond to the address register, followed by another acknowledge. ...
Page 26
... Gas gauge discharge data, bits 8-15 9 Gas gauge discharge data, bits 16-23 16 Gas gauge AD converter data, bits 0-7 17 Gas gauge AD converter data, bits 8-12 18 Number of conversions, bits 0-7 19 Number of conversions, bits 8-11 20 Battery voltage monitor control 21 Battery voltage monitor AD converter data, bits 0-7 22 Battery voltage monitor AD converter data, bits 8-10 STw4102 A Stop Description ...
Page 27
... STw4102 Table 19. REG_CHG0. address 0 (00h) Name CHARGERUN MAINDETECT USBDETECT VCHG SEL_DC_USB USB_ICHG Table 20. REG_CHG1. address 1 (01h) Name CHG_ENA Reserved FORCECHARGER UN SEL_IS Unused Table 21. REG_WDOG. address 2 (02h) Name WDOG_EN WDOG_TIME WDOG_RST Reserved WDOG_INT Unused Power- Pos. Type up 0: Charge is below 10% of fast charge current. ...
Page 28
... Set high at the end of a conversion. Cleared after read. 7 R/W Power- Pos. Type up [7.. Current charge data. Power- Pos. Type up [7.. Current charge data. Power- Pos. Type up [7.. Current charge data. Power- Pos. Type up [7.. Current discharge data. STw4102 Description Description Description Description Description ...
Page 29
... STw4102 Table 27. REG_DISCHARGE_MID. address 8 (08h) Name DATA[15..8] Table 28. REG_DISCHARGE_HIGH. address 9 (09h) Name DATA[23..16] Table 29. REG_CONVDATA_LOW. address 16 (10h) Name DATA[7..0] Table 30. REG_CONVDATA_HIGH. address 17 (11h) Name DATA[12..8] Not used Table 31. REG_CONVNUMBER_LOW. address 18 (12h) Name DATA[7..0] Table 32. REG_CONVNUMBER_HIGH. address 19 (13h) Name DATA[11..8] Reserved Power- Pos ...
Page 30
... No effect Allows to calibrate AD converter. [7, Power- Pos. Type up [7..0] AD converter data in 12 bit mode [6..0] AD converter data in 7 bit mode (bit7=0). Power- Pos. Type up AD converter data in 12-bit mode (0 in 7-bit [3.. mode). [7.. STw4102 Description Description Description ...
Page 31
... STw4102 11 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ® ECOPACK packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label ...
Page 32
... Package information Figure 26. QFN24 package mechanical drawing Figure 27. QFN24 footprint 32/34 STw4102 ...
Page 33
... STw4102 12 Ordering information Table 37. Order code (1) Order code STw4102IQT 1. Order code for parts with standard configuration. Contact STMicroelectronics to get order codes for parts with specific configurations. 13 Revision history Table 38. Document revision history Date 17-Mar-2008 20-Mar-2008 Temperature range Package ° ° -30 C, +85 ...
Page 34
... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 34/34 Please Read Carefully: © 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com STw4102 ...